Telephony.



M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED 0019, 1912.

1,109,166, Patented Sept. 1, 1914.

5 SHEETS-SHEET 1- WITNESSES I INVENTOR Menrou L. JoHusoN.

M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED 00m, 1912.

1,109,166,. Patented Sept. 1, 1914.

5 SHEETS-SHEET 2.

WITNESSES I I G. 2 INVENTOR I MORTON L. JOHNSON M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED 0019,1912

1,109,166, Patented Sept. 1, 1914.

5 SHEETS SHEBT 3.

fl, 1 1i WITNESSES mvnm-ron MORTON L. JOHNSON.

ATTRNBY M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED 0019,1912.

Patented Sept. 1, 1914.

5 SHBETS FSHEET 4.

INVENTOH.

4ATTORNEY' FIG. 1

M. L. JOHNSON.

TELEPHONY.

APPLICATION FILED 001.9, 1912v Patented Sept. 1, 1914.

5 SHEETS SllEET 5.

INVENTOR MORTON L. JOHNSON WITNES 8 ES TN iii E if) OFFICE.

MORTON L. JOHNSON. OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, T0

FEANK B. COOK COMPANY, OF CHICAGO,

ILLINOIS, A CORPORATION OF ILLINOIS.

'ILELIEZIPHONY.

Specification of Letters Patent.

Patent ed Sept. 1, 19 14.

Application filed October 9, 1912. Serial No. 724,753.

1'0 (17/ 'u'fium it" rmzy concern 1 lte it known that I, Moirion L. .Lpnssox, a citizen of the l nited States, residing at (hit-ago, in the county of (look and State of illinoisw have invented a certain new and useful Improvement in Telephony; of which the following is a full, clear, concise, and exa tdescription, reference being had to the accompanying drawings, forming a part of this specification.

Mv invention relates to telephone exchange systems and has for its object the provision of improved automatic mechanism that may be set into operation by operators for the purpose of extending telephone lines.

.\s the invention is embodied calling telephone lines are extended into connection with called telephone lines that constitute the form of telephone line extensions with which my invention is of particular service. though l do not wish to be limited to the nature of the calling line extensions that are added to the calling lines nor do I wish to he limited to the extension of calling lines that extend to subscribers stations in the practice of my invention.

In the preferred embodiment of the in vention employ link selector switches adapted to select idle link connectors which are to form parts of telephone circuits between telephone lilies and their ultimate ex tensions. These link connector switches are set into operation by operator controlled witching mechanism and they are arrested in th ir operation jointly by the operator controlled switching mechanism and mechanism forming part of the link selectors. \l'hcrc connector switches are employed they are also set into operation by the operators equipment and are arrested in connection with the waiting contacts that pertain to the called lines jointly by the operator contr lled switching mechanism and mechanism l'inining' part oi the connector switches.

in practising the embodiment of the in- "cntion herein dis los d the p rtions of the selector and connector switches that to onerate w ill; he operatorsswitching n'ieclne n sm tor the purposes stated are in the term ot tinveling wipers moving in unison with the n iper that enter into the telephone circ iit bet w en the calling and called stations, tin-nigh i do not limit myself to the use of wipers for this purpose as o her portions of these switches may be employed as, for example, is shown in my co-pending application Serial No. 724,754, filed October 9, 1912, (Case 0).

The circuits for arresting the switches are individual to the extensions of the calling lines thereby eflected and are individual to the various positions to which the circuit ex tending portions of the switches are placed so that troubles introduced by circuits that: are common to more than one circuit for arresting the switches are eliminated.

In practising my invention the line we tcndin switch is caused to operate a device which is adapted to operate in conjunction with one of a number of operator controlled devices that are individual to the dill'ercnt positions of the line extending switch to arrest the line extending switch in the position corresponding to the actuated operator controlled device. A switch controlled device is brought successively into such elation with the operator controlled devices that it will cooperate with the actuated one of the operator controlled devices for the purpose stated. These operator controlled devlces are included in controlling circuits that are temporarily made individual to the different positions of the line extending switch and the different link connectors I will explain my invention more tally by reference to the accompanying drawings showing the preferred embodiment ot the invention and in Which Figure 1 is a simplified diagrammatic view disclosing my invention in outline; Figs. 2, 3, 4 and 5 taken collectively and in their numerical order, diagrammaticallv illustrate a telephone exchange syst m equipped in accordance with the invention. Figs. 2, 3 and 4 being read in t'itiliii t'l'inii with each other with the heavy conductsns at the top portions thereof in aliuena-ut while Figs.- 4 and 5 are read in connct'tiwi with each other with the eoiuluctors extt. ing lengthwise of Fig. 5 in alinement the conductors discontinued at the in hand long side of Fig 4.

The invention is clearly suggested by are diagram shown in Fig. l. the portions of tie system not illustrated in Fig. 1 being iilm. trated in the remaining figures.

T wilt not describe Fig. 1 in detail owing to the de scription that will be given in eonnectio; with the remaining figures and in conneaj:

ti ti ,lector switch into operation tion with which description of the remaining figures Fig. 1 may readily be read as similar ports in the different figures have similar characters of reference.

In describing the invention as disclosed in Fig. l, the party at the calling station, 211 for example, will, as a conseipience of the removal of the. receiver atthe calling station from its switch hook, set the wipers of an automatically operating operator seuntil the wipers .1 and J of this automatically operating switch become arrested in connection ith the telephone 5 connected to thewaiting contacts engaged by the wipers 1 and 2 of the operator selector switch whereby such se lected operator is able to communicate with the calling subscriber to ascertain the number of the line desired by the calling sub scriber. Each operator has a key (S that serves to set the wipers of a link selector switch A into operation, these wipers continuing to move vertically until they are arrested by means to he LlQSCIllKL'I. The lowermost Wiper 7 of the selector switch A is provided with a set of vertically arranged waiting contacts which are in circuit connections with current sources furnishing current of differing characters. As the invention is embodied these waiting contacts are grounded through sources of current of differing potentials, which are successively brought into circuit with the volt coil of an instrument which may correspond to a volt meter, though obviously the nature of this instrument will vary according to the characters of the current with which the waiting contacts of the wiper T are connected. In the case of a voltmeter the volt coil 8 is successively included in circuit with currents of different voltages so that the needle 9 of the volt instrument is swung tv ext'ents in keeping with the increasing voltage to which the volt coil subject. As the invention is illustrated the first two of the waiting contacts, reading from the bottom of the row, similar potential. one of these contacts, however, being connected with positive battery indicated at 10 and the other of these waiting contacts being connected with the negative battery indicated at 11, The needle 9 is therefore moved up one step from normal when the wiper '7 engages the first waiting contact and down one step from normal when the Wiper 7 engages the second contact. Owing to the conneetions illustrated when the wiper T engages the third contact the needle 9 will he moved two spaces upwardly from normal and. when the wiper T engages the fourth crmtact the needle 9 will be moved twrfspaccs downwardly from normal and so on through the range of vertical movement of the wiper '7. The potential of opposite polarities impressed upon are connected with current of the two lower waiting contacts of the wiper 7 may be of twenty volts, the potential of opposite polarities impressed upon the 'next two waiting contacts may be of forty rolts, the potentiiil of opposite popolarities impressed upon the next two waiting contacts may be of one hundred volts. The needle or swing arm 9 is thus brought to positive positions corresponding to the vertical positions of thewiper 7. \Vaiting contacts are located at the various positions to which the needle 9 brought by the arm T and the sources of current successhely brought into circuit with the arm 7. These waiting contacts are connected with stationary contacts of operators keys that are distributed in three vertical rows B C D. The needle 9 is grounded so that the stationary contacts of the keys B C D are grounded when the waiting contacts with which the stationary contacts are connected are engaged by ed needle 9. Through the medium of electromagnetic mechanism and circuits established by conjoint operation of the wiper T and its waiting contacts, the needle 9, its waiting contacts, and the keys in the row ll, the automatically selected operator is enabled to cll'ect the operation of the relay 12 to arrest the vertical movement of the wipers of the switch A at a level corresponding to the level of the actuated key at B. The upper key in the row B serves to arrest the wipers of the switch A after they have been moved to the first level. The next key in this row serves to arrest these wipers in their second level, the next key in the third level, and the next key in the fourth level, etc, there being as many keys in the row ll as there are levels to which the wipers in the switch A may he stepped. After the wipers in the switch A have been brought to their proper level these wipers are autoumtically rotatively stepped around. until the wipers l3 and 14 engage the waiting contacts of the idle link ,connector that terminates in talking wipers l5 and 16. The key 6 will now serve to set the wipers 15, 16 and 17 of the connector switch into operation, these wipers continuing to move vertically until they are ar rested by means to be described. The wiper 17 of the connector switch is provided with a set of vertically arranged waiting contacts which are in circuit connections with current sources furnishing current of dillering characters. As the invention is embodied these waiting contacts are grounded through sources of current of differing potentials which are successively brought into the ground- "mi: with errii. pee-1 .e Lo (fil -Ilia duff, voltage to i As the in contacts :1 ith the which like rention f the a batteries ll) hatteri clearness) an: association of wiper 7 wz \olt coil I for the sake of Ell ol toil 8 similar to the ailing: contacts of the H) and 11 and said (i is mo ed in k epfiniljiil. oi the wiper re minding nuiveincnts respect to the wiper T. 5. ser es to arrest connector switch aftcr d to n:- first level. The

stop these w pers at the in next w n the third P in i 1 lonrth level,

0:: in the row C wipers in .cppedi The been brought inn, waiting contacts fl l say the line wipers are l5 and l fi e dcsirml i .aiylniwd with the lfifirifllii?! wiper li Of waif-i of waiting wiper fi sweeps. 1 m coil 7. the

- row 1") nor- 7 (Mdzlcls of he i muijnent which ::i eonncction as 'n of 1hrconnector upon a m'iiilil' flll i waiting contiu're ere levels to brought. sin'iilarly Elie hanli'a of naii'ing j r l? heing: inultipied.

sets of A in: sli'iii f i waiting *4? halo, ice lacing we: r the conto the lm el couture 2&1. understood ncctnr sw tch i containing the waning! ita t of the dci sircd line, these \vipcrs e sutoiuatically rotated as 1: c-rinsen ii the operation of the key (5 and inc" nism later to the wait; 1;: an association and the volt of the waitand 17 vith there being i nat on it: thatithe are m coniwr oi The fil-t. countered hy the wiper 191 are employed to more the needle 9 one space each side of the normal position of this needle, the next two contacts are employed to effect the more ment of the needle 9 two spaces each side of the normal position of this needle and so on, the rotation ofthe wipers 15. ](i, 17 and 18 erasing when circuit has been established through the needle 9 and the depressed key in tll'l? row D eorresponding to the waiting contacts of the desired line in the level over which the wipers of the connector switch are moving.

I will now more fully describe my invention by rcterencc to Figs. 2 to 5 inclusive.

When the calling subscriber at station 211 tl i tl'. 21 removes his receiver 19 from its switch hook 20 a circuit closed at the i-\\'l[('li hook 20 and its alternate contact which may be traced fromjhe grounded common battery 21, the upper winding of relay :22 the uppernmst armature switch of relay :23 and its normal contact, the upper intermediate armature switch of relay .i l itsv normiil contact. both sides of the allinn liner the lower l1lt(.lli3l.illtlt armature s Yiicli of relay 24 and its normal Contact, he lower armature switch of relay 23 and its normal contact. to the lcwcr grounded coil oi relay 522. The relay 22 thereupon 21ttracts its armature switches, circuit being estai lished which may he traced from the interim {hate grounded armature switch of rel;. 1:) and its alternate contact. the armainrc switch of the sln g'gishl operating IU' lay 2? the winding of this rel: the winding of rotary magnet the side switch wiper :27. to the grounihwl miter 21. the illustration of this hatlcrr itillrtf repeated many iinie for the wakeof clmrness. \Vhen the rotarr magnet 2 is (!H'! {i7.0(l it sets wipers l. and 2!) of the operator selector switch into operati n until the wiper 2 cue-nntcr. an unproumled waiting conta t whereupon these wipers will become arrested with the wipers l and 2 engaging the waiting contacts con tituting terminals of condnclnrs leading to an idle operatoi'ls telephone i). The wiper 1i 2. and Q are arrested as described owing to the opening oi the circuit for the prirate inan'rct 530 when the wiper 29 engages an nngronnded waiting contact the circuit ffllllll? magnet 30 having beeninitially estahli hcd upon the ini ial niei'gizalion of the rotary magnet {71 ll'hen the priwite magnet 20 is d ij nergized the side switch wipers :27 and 51 are stepped lhln their second and final posnicns. The side switch wiper 31 is grounde when in its sect nd position, sc as to ground the wait ing contact engaged by the wipc'r 29 and all other similarly positioned multiply related contact of other operaioi .clcctor switches so that no operator selector switch can be operated by any other cullin; subscriber in a manner to become connected with the opcrators telephone 5 that has become connected with the calling subscriber Ell. i lhen the side switch wiper is in llrecond position circuit for the rotary magnet 2cis opened so that the wipers 1.1% and 23) will remain with the wipers 1 and Q in connection with the telephone 5. A signal may be employed at each operators position to have circuit closed therethrough when an operatofis telephone 5 is selected in the manner which has been described, circuit governing this signal 32 being); traceable from the side switch wiper 31 whei; {grounded in its second position, the wiper 2 the aiting contact engaging the same. the winding of relay 33. to the grounded battery 21. The relay 33 there upon attracts its armature sw tch to close circuit for the relay 32, which circuit is ap parent. The operator being in telephonic communication with the calling subscriber ascertains the wants of the calling subscriber and for the sake of illustration it assumed that the calling subscriber desired communication with the subscriber at station 212.

The operator will depress the second key from the top in row B. the top key of row l. and the second key from the top of row 1), these keys remaining depressed either by the hand of the operator or by automatially released means whereafter the opera- (or momentarily depresses the self-releasing key 3 (see Fig. Key 0, though the last depressed, is the first to become effective, it serving to ctl'cct the elevati n of the wipers of the link selector switch A (Fig. 4). The key (3. when depressed establishes a circuit whi h may be traced from the grounded spring of this lzey, the two contacts to the right of this springthat are connected when the key is depressed. the tollrw-up normal contact of the armature switch immediately to the right. of the relay Flt. to the grounded hatteryQ]. This armature switch engages its alternate contact to establish a locking circuit through the relay 34, which locking circuit may be traced from the grounded battery 2], the relay 34, the said armature switch and its alternate contact, to the left hand grounded armature switch of the sluggishly opcrutirg relay 35. A circuit is also established that may be traced from the grounded spring of the key 6, the contact next adjacent thereto. "the \Tll'ltlllifl of slugnishly operati r m as. to the g inded battery 21. \Vhen relay 30 is energized it establishes a circuit which may be traceu from the grounded battery '21 the alteinate contact of the right hand armature switch of this relay 3! the second armature switch to the right of relay 34 and its alternate contact, the talking wiper 2 and the waiting contact engaged thereby, the intermediate armature switch of relay 3? and its normal contact, the winding of relay 38, the intermediate armature switch of private magnet and its normally engaged contact, to the graumicd lower coil of relay 2: 3. The relay 38' is thereupon operated to establish a circuit which is traceable t'rcm the grounded battery 21, the armature switch ofrelay 3 the winding of relay 81'. to ground. A locking circuit is cstal'ilished fer relay 3? which is lraceablc from the grounded coil of this reh through its lowermost armature switch a; its now engaged contact. the contact engaged by the side switch wiper L? in its sec; ond position, said side switch wiper, to the grounded battery 21. When relay 3'? 1s operated it breaks connection between the calling line and the operator at the two upper armature switches of relay 3T interposed bctween the wipers 1 and 2 and the calling substation. By breaking the circuit at the p upper armature switches of relay 3., calling line equipment is disconnected from the talking; conductors leading from these ar-' mature switches to the second and third armature switches at. the right of relay 4, and as the operators telephone 5 is now disconnected from these telephone conductcrs such telephone coinluctors may be employed in etlctiii'zpg connection between calling and called lines. The slug \h oprating rel'ay 3-6 bec unerestored, a the key (3 is relased and restores itself. as a consequence of which the circuit is established which is traceable from the left hand g'r-vundcd armature switch of relay 3t, and its engaged contact, the left. hand armature switch of relay 5+ and its engaged c'intact. the right hand aimatui'e switch of relay I3 and its norma ly engaged contact. the winding of re lay 4-0. to the grounded battery 21. \Vhen the relay to is thus energized a circuit is established which is traceable from the left hand grounded armature switch of relay 40,-

its then engaged contact the right hand armature switch of sluggishly ope ating relay t1 and its normally engaged contact, thi armature switch ot' relay Zlt and its now engaged contact. the third armature switch from the right of relay 3 and its now engaged alternate contact, the talking conductor leading to the waiting contact: now ongaged by the wiper l. the wiper 1. the upper arnniture of relay 3? and its alternate contact, the upper intermediate armature switch of relay 4'2 and its normal contact. the winding of relay 1?, to the grounded battery Circuit for the vertical magnet 4-3, that is mployed to elevate the wipers 7, 13 14 and '44, is now established and may be traced mature switch of relay 3t) and its normal from the grounded battery 21 through the i'li'Cllll} interrupter 45, the vertical magnet the lower intermediate armature switch f relay 26 and its normally engaged con (act, the lowermost armature switch of relay it and its now engaged contact, the lowermost armature switch of relay 42, to groundv The vertical magnet is inter inittenily energized owing to the circuit interrupter and is therefore intermittently operateo to step the wipers 7, 13 14 and 44 to ditlerent levels. Owing to the circuit interrupter 45. the wipers of the switch A praise in each of the levels to which they have been raised a sufiicient length of time to permit the wiper 7 to close circuit throu h the roll instrument coil 8 as generally escribed in connection with Fig. 1, the circuit through the volt instrument coil being traceable from the battery 1001' 11, the waitlug contact of the wiper T that happens to be engaged by this wiper, the lower intermediate armature switch of relay 42 and its normal contact. the inte mediate armature itch of relay 37 and its alternate contact, the wiper 2 of the operator selector switch, in: second switch to the right of relay 34 ind its alternate contact, the right hand ar-V contact to the. grounded volt coil 8. The second key from the top of row B was previou: l described as having been depressed, th lays in this row corresponding to the leach to which the wipers of the link selecso: switch. A may be raised. As the wipers he switch A are now to be raised to the wo ld leel the second key from the top of you l depressed so as n'enable this staiiiry contact to become connected with 'aitin contact next below the normal r -1tnui of the needle 9. When the wiper dgxf-l the second waiting contact from Ec-otlwn ol the row of its waiting contact,

A? Us i is stablished which is traceable i l eu ih 3'roun(letl needle 9, the waiting conicinatcly below the normal position I llc 5? the stationary contact of the 1 x} lroni the top oi' row B the con ot' this key. the sluggishly opl :ciay 41- the now atlrzwted rigbtl 'ln t lle -witch of relay to to the y battery :11. Circuit for the relay l eram-qucntly opened at the right hand i mice switch of relay ll. "hen the cirl 2a.! of elay 1: is opened its armature; ent: luvs are released and a ground is mol l l l l l l iirily app ied to the coil of relay 4t M the sluggish release of relay 47 ,l had itsi'll'cli t previously closed at the and the armatur swiv'h of relay 1% ol relay l i and its alt -roan c an 1. i winding 01 slung t l'lllilrnormal follow-up contact, to the ri hand grounded armature switch of slugg op erating relay 4%. which armature switch has been attracted to engage its conta t circuit for the relay 48 having been previously tablishcd at the lowermost armature switch of relay The circuit for the verti al magnet 43 has now been opened at two points, the lower intermediate arnniture switch of relay 46 and the lower armature switch of relay 12 so that the wipers of the switch A remain in the level in which they have been brought. The relay 4-6, when it energized, includes the rotary magnet ti in a circuit which is traceable from the ground ed battery 21. the circuit interrupter full the wind ing of the rotary magnet 49 the lower A until these wipers enga t the idle lllllf circuit, that is until the wiper 4 1 cw ig c a waiting contact which is connectco with ground through battery and which line no direct connection with ground, the aiting contacts of the wiper 44 eing direcly grounded when the link circuits; il 5 tiltllwith these waiting contacts are busy and e ing grcundet'l only through battery wheat link circuits are idle When th wiper H engages a waiting contact that i not di rectly grounded. thc sluggisbly oper. re lay 51 is encrggiz-i d by a cir uit tau-cable from the grounded lmttery Fl ll:- winding ot slugyishly operating the nornuil 'l'ollo\\'np ntact ot tin i arinaturc --wlon f i' hz} ture swit h. the r i 5 inta t c1; the wiper 4 i. it

and will;

ly fllltiridiihgj it ground The relay f l [llGlt' UUF a circuit which l-i triuer i from it, ed armature switciu the thereby, the winding of c ay i grounded battery it. The relay i; tuill lishcs a lockingcircuit which may is from the grounded battery iii. the inding: of the relay l; the u permost w-naiure switch of this relax and its ultciiiaic con i iaic conta t of tiis armature switch. v tact. the ari'nature switch of relay fiend ll'; 'iit relay lll is i"d(*(r;'\l)l0 from the then engaged crmtact to ground" lt'lien the hu led battery ill. the riding of relay l relay 42 is energized it opens tllt' circuit tor the still attracted armature switch of lun' ishly operating relay 47. the upper at I .uiature .\'itch of relay 12, to grouno by way the rotary magnet 49 at the loweru'iost at mature switch of relay 42 whercui ion the wipers are brought to rest in connection with the idle link circuit. When the link circuit is busy the associate waiting contacts belonging to the wiper 44. are connected directly with ground either at the armature switch of relay 48 (Fig. 3) or at the uppermost armature switch. of energized sluggishly operating relay 54, which relay is energized by a circuit traceable from the grounded battery 21, the winding of the relay 54, to ground, the relay 55 having been energized in a manner which will later be described. Vl'hen the buttons of the wiper 44 are limited to direct connection with ground the relay 51 will obviously not be energized so that the rotary magnet 49 will continue in operatirm. \Vheu relay 4'2 energized the locking circuit for the-relay 46 is broken by the separation of its upper I armature switch from its normal follow-up contact whereby the relay 46 is restored to normal, the denergization of the relay it; enabling the grounded armature switch 48 to becomeconnected with the wiper 44 by a path traceable from the grounded armature switch of relay 48, the uppermost armature switch of relay 42 and its alternate contact, the uppermost armature switch of relay 46 and its normal contact, to said wiper 44. \Vhen the relay -12 is energized the intermediate armature switches thereof connect the talking wipers 13, 14 with the wipers 1 and 2. When the relay 41 (Fig. 2) is energized a circuit is established which may be traced from the grounded contact 'of the left hand armature switch of this reof relay 36 and its contact. \Vhen relay 13f) is energized circuit for relay 40 is opened at the right hand armature switch of relay 39. \Vhen the relay 40 is thus deenergized ground is removed at its left hand aru'iature switch from the conductor leading to the waiting contact engaged by wiper 1. Circuit for relay 41 is also opened at the right hand armature switch of relay 40 to prevent faulty operation of relay 41. \Vhen the relay 39 is energized a circuit is estabg lished at its left hand armature switch that may be traced from the grounded brush 56,

contact, the left hand armature switch of relay 60 and its normal follow-up contact, the winding of relay 60, to the grounded hattery 21. A locking circuit is established for the relay 60 which is traceable from the grounded battery 21, the winding of relay (30, the left hand armature switch of this relay and its alternate contact, the left hand armature switch of relay 3. and its then engaged contact, to the left hand grounded armature switch of relay 36 and its then engaged contact. The relay 60, when thus energized. etl'cets the establishment of a circuit which is traceable from the brush 61, the driven dislc 32, the brush 63 momentarily engaged with the disk 2 once in each revolution of such dish, the right hand armature switch of relay 0 and its then engaged contact, the right hand armature switch of relay 64 and its follow-up contact, the winding of relay 64, to the grounded battery 21. A locking circuit is established for the relay 64 which is traceable from the grounded battery 21, the winding of the relay 64, the right hand armature switch of this relay and its alternate contact, the intermediate armature switch of relay 60 to its grounded contact. When the relay 64 is energized a circuit is established which is traceable from its left hand armature switch and the grounded contact then engaged thereby, the right hand armature switch of relay 65 and its engaged contact, the winding of relay 66, to the grounded battery 21.- The relay 36, when energized, establishes a circuit traceable from its left hand grounded armature switch and the contact engaged rherel'iy, the right hand armature switch of sluggishly operating relay (37 and the contact engaged thereby, the intermediate armature switch of relay 36 and the contact engaged thereby, the third armature switch to the right of relay 31am] the alternatc contact engaged thereby, the waiting contact engaged by the wiper 1, the upper armature switch of relay 37 and its alternate contact, the upper intermediate armature switch of relay and its alteruute.contact. th v wiper 153, the upper intermediate armature switch of relay 68 and its normal contact, the winding of relay 69, to the wipers of the connector switch to the level containing the waiting contacts of the desired orto he ca l lril line The extent lUWlllrli the wipers of the connector switch may be elevated is determined by the key in. the row (1 which has been depressed. In this ca e, tilt called suhsrrilmr being No. 212, the uppermost key in the row C has been depressed so that when the Wiper 17 engages the first contact at the bottom of its vertical row of waiting contacts to close circuit through the winding 8 to bring the needle 9 into engagement with its first waiting con tact above the normal position of this needle, a circuit is wtahlislml which is traceable from this neei'lle, which is grounded, the

waiting contact immediately above the norand position of the needle, the stationary contact of the topmost key in the row C, the spring of this key, the winding of slug; gishly operating relay (37 the right hand armature switch n? relay ($6, the Contact of this armature s tch to the grounded battray 31. The circuit established for the volt coil h to bring the needle 9 into engagement with he waiting Contact immediately above thev normal position of this needle, may r adily l c irac 13 from he twenty volt lead of th lift-cry the waiting contact eonntwlz l thi-v lead, the wiper 17, the lowermost fiIlZ'-t=!:al=:\ switch of relay 73 and its normal the lower intermediate relay armature no and its normal contact.

!L V- I a the nicer l and it engaged waiting conta t the ow interin liate armature switch of relay s alternate contact, the im rnicdi w tell of relay 3? and its aliene Wiper .3 and ig ou itl m1) 5h, t, tilt H ,"H'l Flt llZ'Tli the right of rehn l and its alternate contact, 5hr right liar armatu e switch of relay i and its normal contact, to the grounned roll coil lhrn the relay 67 is energized ti l and tin ta b :pened at ell-. 11: a Mina; .tyi l ot relay o hen ircuit relay on is opened, its uppe grounded rniati're switch engages it coin tact a enroll lP Hfl nimnentarily established lily '7 owing to the slnggishness "ll lllt acing" tracrable from leii armature switch of rei i-ontarl, the armature o slugt'fi relay 1': and its contae, r i a ,1: or rein ill to the groui'ided hatry in he "clay Tl i"-'lili)li5lltt a locking *n-euit for its; ll which i cahle from the tmlnd-ml batt ry ill throng-i the winding of the relay i upper :l' illlll'Q switch of llil relay and it: contact; the upper arnia- 'urc swit h oi i lay 53 and its normal tollow-up contra t the wiper l4 and ts engaged waiting coniart. the upper armature switch relay 75 t the armature switch oi relay E72 and its alternate contact the armature switch of relay 48 and its contact, to g mind. When relayTS i: enPlQlZttl circuit tor the xertical magnet 70 opened at tin: intermediate armature switch of relay 73 and ilk: normal contact, such circuit also being opened at the lower-- most armature switch of relay (39 wherehy vertical movement of the wipers of the connector switch ceas 9, these wipers having been brought to the level which contain the waiting contacts of the desired line. \Vhen relay 6? was energized it established a circuit at its left hand arn'iature switch traceable from the grounded contact of this arma-- ture switch through the switch, the intermediate armature switch of relay and its normal follow-up contact: the winding of this relay, to the grounded battery 21. The relay G5 establishes a locking circuit fo r itself which is traceable from the grounded battery 21 through ts inlvrnmliate arinaturn snitch, the alternate cont-rt of this switch, to the left hand ari'uatuze switch of relay (it and its the-n engaged grounded contact. \Vhen relay n5 is energized a circuit is established tractable from the grounded hrush fit through the disk 57 the brush 58 when engaging the disln the left hand armature switch of relay 6.) and its engaged coir tact, the left hand armature switch of relay i l and its normal fOll HV-llll contact, the winding of relay Tl to the grounded hat.-

tory 2L The relay 7-! eetalilishes a locking circuit f r itsel i traceahhfrom the grounded throv 'l',

il 'ed ta l? a Y' t-Jl] traceable l'roir oat tei r it and its the normal follow-norms H armature switch of relay 7:1 to the )21- t hatter 21. The. fitahlist s a lock ng circuit for itself traceable from the liounded liatttery 21 through the winding of the rela the right hand armature switch of this relay. alternate oi this armature armatu e rant h .giiti 00h! i to the r relay i4. to l by this intcrtued I; now (F 31 from the ground d relay Til, the left relay 75, to the K by this rtlllltllill'i tahlishes a irc ns hand grounded ai-nn engaged therehy. l

switch of sluggishly operating relay 77 and the contact engaged thereby, the intermediate armature switch of relay 36 and the contact engaged hereby, the. third armature switch from the right of relay 3t and the alternate contact engaged thereby, the wiper l and the waiting contact engaged thereby, the upper armature switch of relay 3? and the alternate contact engaged thereby, the upper intermediate armature switch of relay and the alternate contact engaged thereby, the wiper l3 and the waiting con tact engaged thereby, the upper intern1cdiate armature switch of the relay 68 and the normal contact engaged thereby, the re lay (it), to the grounded battery 21. The relay (39 now establishes a circuit for the rotary magnet- 78 which serves to rotate the wipers of the connector switch, this circuit being traceable from the lower grounded armature switch of relay-.53 and the contact engaged thereby, the lower armature switch of relay (in and the contact engaged thereby. the intermediate armature switch of relay Til and the alternate contact on gagcd thereby, the sluggishly operating relay 79, the rotary magnet T8. the interrupter Tl, to the grounded battery L1. The wipers of the connector switch now rotate step by step in the level to which the were pie yiously raised until the wiper l8 ages the waiting contact that brings the volt coil into such a circuit that will cause this volt coil to swing the needle 9 into engagement with the waiting contact that is connected with the stationary contact of the depressed button in the row I). In this instance the Seccnd button from the top of row I) has been depressed so that the wiper 18 will perform its function when it. engages the second button -in the row of horizontally arranged waiting contacts to whose level the wiper 18 was previously raised, it being understood that the waitihg contacts for the wiper 17 are arranged in a vertical row and that there are as many levels of waiting contacts for the wiper 18 as there are leyels to which thewipers of the connector switch may be raised so that the wiper in will encounter waiting contacts as it is turned step by step, in any level to which this 'iper is, placed. similarly positioned contacts for the horizontal rows of waiting contacts for the wiper 18 being in multiple connection. The circuit established by the l wiper 18 through the coil 8 is traceable fronr groundthrough the coil 8. the right hand armature switch of relay 3G and its normal con act, the second armature switch from the right of relay 3i and its alternate contact, the wiper and the contact engaged thereby, the intermediate armature swltch ofrelay and its alternate contact. the

lower intermediate armature switch of relay 1 4i and its alternate Contact, the wiper 14 which the waiting contact is engaged, in'

this case the battery 11 as it 15 connected with the second waiting contact of the wiper In, this battery iinpressing twenty volts upon its wailing contact. The wiper or needle S) now engages the waiting contact the first space below the normal position of the needle 2) whereby the stationary contact ot' the second key from the top of the row l is grounded. This coil thus serves to establish a circuit which is traceable from the ground thus placed upon the stationary contact of this key, the winding, of slugishly operating relav T7, the right hand armature switch of relay To and its engaged contact, to the grounded battery 21. The relay 77 opens the circuit for the relay on at the right hand armature switch of relay 77. When the relay to is decnergized its upper armature switch establishes a circuit whi h is traceable from ground, the upper armature switch of relay (3), the contact engaged thereby. the right hand armature switch of slugghshly operating relay T9, the winding of relay 5 the winding of relay (7-8. to the grounded battery 21.

.The relay 53 establishes a locking circuit for itself and for the. relay which is traceable from the grounded battery 21. the windings of these two relays. the upper ar mature switch of relay 5,3 and its right hand alternate contact. the wiper -14 and the wait ing contact engaged thereby, the uppermost armature switch of relay l t; and its normal contact, the uppermost armature switch of relay 4:! and its alternate contact. the right hand a 'inaturc switch of relay -18 and its contact, to ground. Circuit for the rotary magnet 78 is now open at the lower arn'iature switches of the relays 33 and 69 so that the wipers of the connector switch are arrested with the wipers l5 and us in conne tion with the waitinp contacts belonging to the desired line No. 1H2. It will be observed that the disks 57 and 62 have peripherah 'irojections't'or engagement with the brushes 58 and (33. These peripheral projections are so angularly displaced that a considerable interval of time will elapse between the connection of the brush 58 with the disk 57 and the subsequent connection of the disk 2 with the brush 1 preferably cause this time inter al to be about one second in duration. This interval of time will he sutlicient to allow the wipers of the idle link selector switch A to seek an idle link after these wipers have been raised to the desired level. This time interval is also employed to err 1, .3 ea, tit

alile the relaya at the coimr i' r pcrt rin their :awitching i unrtionis after the miners of the connector switch hare ween l The, relav and the contact engaged thereby, the lower most armature switch of the private. magnet 30 and its engaged contact, the relay 12 i, to the grounded armature switch of re lay l8 by way oi its contact. The relay .l-l cstahlishes a locking, circuit for itself traee ahle from the grounded liattery i3, through the loacrmoat armature 1\\li(ll ot relay 2i and itr engagedeontarhthe windingot' relay it, til: armature switch of relay f and its cl intact, to arr-"uni. cratcd the ground connection previously tahlished hy the relay for estahlhhiue; the circuit of the relay 11": is removed hat is replaced by the grounded upper armature switch of the stluggishly operating relay 54 in a manner to he deeerihed. \Yhen relay 24 is energized circuit for relay 22 is opened at the intermediate arn'iature switch of relay ll whereby the relay .22 is dcl nergized to release its armature switches. ("ircuit for the release magnet 80 of the idle opera tor selector switch is established at the in termediate armature switch of relay when engaging its normal contact the oil normal switch 81 having previously lien cloned. All of the wipers l, etc" of the idle operator selector switch are now re stored to normal. The relay 3? is conse quently detaiergized completing the restoration to normal of all of the equipment of the idle operator selector switch that was employed to connect the (filling suhscriher 211 with the tel phone equipment The attra ted left hand armature switch of relay 3:35 open the locking circuit for the relay ll to reetore it to normal. [locking circuits for the relays: Z3), (M and. Tl are opened at the left'hand armature switch of the dei nerg fized relay 3 to restore these relays 3% a and 7+ to normal. The relaya (34 no, and T are emiswpiently restored to norniai \-hcrel v all oi the operator s equipment which was emplored in extending the calling line i:; restored to normal. \Vheu the w ipcr 29 is i -t-red to normal circuit for the relay 33 to normal. When rr ll ci'inneci's tl iulerined tallti and i in} relay :Zl. armatu pened to rest re i it a enery ixeil in; way oi lih a: dc i nla' =mediate armitur fan-claw d When relay as ia rutailed it awit hcn a e att acted to iiioun- 'When the relay 24 opc 3 um d li with their alternate eontaets i' llei'llj' the waiting contacts; engaged hy airs ill and l t are connected with the conductors that extend to the talki! A wipers l3 and l i. When the relay ()8 was rncrguied it eatalilished a circuit tilt'F-dflll the relay 5 trawahle from the Lrromuled hattcry :51, the upper winding 'ot relay 533, the normally positioned armature switch oi relay 82 and its: c ntz ct, the upper intermediate :1 :are switch of relay (3S and its altein; contact, the wiper 13 and its engaged waiting contact, the up per intermediate armature switch of relay l2 and its alternate contact, the upper intermediate armature switch ol" relay ll and ite alternate contact, the telephone receiwr, transmitter and switch look at the calling station 211' and the alternate conct ol' thisv switch hook, the lower interment, a

diate armatum switch ot' relay 2 lancl its alternate contact, the lower intermediate armature switch of relay i2 and its alternate rontact, the wiper H and its engaged waiting contact, the lower intcrmmliate armature switch of relay (3S and its alternate contact, to the grounded lower coil of relay 55. The relay 35 serves to energize relay Si by a circuit established by way of the upper armature switch of relay 5."). When relay 5i. is energized its upper gruunded armature switch engages its conta t to replace the ground removed at 48 from the relays 24, 42, 53 and US. \Vhen the wipers ot" the connector switch have heeonie connected with the called line wiper 8:3 oi the connector switch estahlir-zhes a circuit which may he traced from the grounded hattery 2L the winding of relay 84, the alternate contact of the armature switch of relay 55. the wiper 83, the uppermost armature switch of relay 2% pertaining to the called line and its normal contact (Fig. 3), the u'ppermost armature switch of relay E32 pertaining to the called line and its normal contact the relay 23 pertaining to the called line. to the grounded battery 21, the circuit for relay 83 having previously been meinentarily estahli:-:hed at the lower contact of the sluggis'hly operating relay 7i) and the rcleaeacd upper armature switch of relay 19.

The relay H4 will not he energized if the dc I-lll't l line is tree lo! connection with liinn wind in:

the ine sinre the upper lern inal ol the of relay S is not connected with ground when the desired line is l only mnnccted with the same tcrininai of the haiieiw' l with whith the lower trrminal oi thrwindinq o'l relay hl iirllilt 'tt'ii .Yhr-i: the lkir d line laisy the fl lni' terminal of relay hiconnected w th ground at tintupper armaich of relay I34 el' another conuec r en trh in raw the desired line is a previ- -ir v' ialicd nc l!" the desired line Eli itself a calling line the upper terminal of the relay 84 is connected directly with ground at the uppermost armature switch of relay il-l pertaining to the desired line and the alternate contact of this uppermost armature switch or, at one stage of the connection, this direct ground is established by the uppermost armature switch of relay pertaining to the desired line and its alternate grounded contact. When the relay 84 is energized, which is the case when the de sired line is busy, it establishes a locking circuit for itself which is traceable from the grounded battery 21, the winding of relay M, the armature switch immediately above the winding of relay 84 and the contact engaged by this armature switch, the upper armature switch of relay 54 and the contact then engaged thereby, to ground. The relay 8! then becomes effective to place a busy tone upon the telephone circuit leading back to the calling line. This busy tone test is applied to the line by means of the bridge connection established between the talking sides of the line leading back t the calling line, which bridge connection may be traced from the alternate contact of thc loner intermediate armature switch of relay st, the conr'lcnscr S the secondary 87, to the alternate contact of the second armature an itch aboxc the winding of relay til. The busy tone is cll'ectcd by mans oi the circuit inierrnpte' 558 in circuit with the primary 8!) and the battcry 21. In the cwnt at such a busy tone the calling subscribcr rcstrrcs hi tc cphone receiver upon its sniti boa-l: t rcsiore the equipment which was clap-l ycd to cli'cct the transfer of die busy twin to the calling station, the restoration of this apparatus being cxplaiucil latrr.

Assuming that thc desired line is free for ur the cclay Fl will remain inert and the cutoff relay :3 pertaining to the desired line 212 will be energized so as to prevent the operator ritliltw' switch associated with the calling line ir in being operated when the called party responds. The circuit for the relay 12 3 pertaining to the called line thus (atablishcd is, traceable from the grounded battery 21 through the winding of relay 23 of the called line, the uppermost armature switch cl' relay 2' of the called line and its normal contact, the uppermost armature switch of relay 2i and its normal contact, the wiper and its engaged waiting contact, the armature switch of relay 85 and its normal contact, the uppermost armature switch of relay *3 a and its contact, the upper armature switci of relay 53 and its left hand alternate contact, to the grounded upper armatrrc 1\= itch of relay 54- and its enaged contact. The called subscriber's sigr i I nal bell 90 1: included in circuit with the generator 91 owing to the energization of the relay 92 which was eli'ected by a circuit traceable from the lower grounded armature switch of relay and its engaged contact, the lower switch of relay 84 and its engaged contact, the lower switch of relay 93 and its engaged contact, the winding of relay 92, to the grounded battery21. The relay 92, when energized, establishes a signaling circuit through the called subscribers bell 90,

which circuit maybe traced from the right hand pole of the ringing generator 91, the alternate contact of the upper armature switch of relay 92, the wiper 16 of the connector switch and its engaged waiting contact, the lower armature switch of relay 23 of the called line and its alternate contact, the lower intermediate armature switch of relay 24 of the called line and its normal contact, the switch hook 20 of the called line, the normal contact ofithis switch hook, the condenser 94 (employed to maintain. circuit through the relay 22 normally open when the telephone receiver is upon the switch hook), the signal bell 90, the upper intermediate armature switch-of relay 2i of the called line and its normal contact, the upper armature switch of relay 23 of the called line, and its alternate contact, the wiper 15 of the employed connector switch and the waiting contact engaged thereby, the upper armature switch of relay 92 and its alternate contact, the winding of relay 9:). the circuit intcrruptr' r 96 employed to cti'u-t intermittent operation of the signal J0, back to the generator ill. The relay Si?) is of such resistance and adjustment that it will not be operated y current passing from the generator 01 through the calied subscribens hell [)0 and the associate =i 111dQI1SQP 94. hen the called subscriber removes his telephone from its switch hook the continuous path through the called subseribers receiver and transmitter is substituted for the path including the condenser ill and bell 90, this substitute path bcing of sullicicntly low resistance to permit the current from generator 91 operatively to energize the relay 95. \Vhen the relay 95 is energized a circuit is established which is traceable from its grounded armature switch and the contact then engaged thereby, the winding of relay 93, to the grounded battery 21. When the relay 93 is energized it establishes a locking circuit for itself traceable from the grounded battery 21, the intermediate armature switch of relay 93 and its engaged contact, to the grounded upper armature switch of relay 54 by way of its engaged contact. \Vhen the relay 93 is energized it opens a circuit at its lower armature switch for the relay 92. The relay 9;? thereupon releases its armature switches to cut the generator J1 out of circuit, to connect the talking wipers 15 and 16 of the connector switch with the sides of the calling line in a manner that will be understood from the diagram and to switch of relay 68 and its engaged contact, the lower intermediate armature switch of relay 84 and its normal contact. t lowen armature switch of relay 2% normal contact, the talking wiper 16 of the connector switch, the lower armature switch of relay 523 of the called line and its alternate contact, the lower intermediate armature switch of the relay 24 of the called line and its normal contact, the switch hook 20 of the called line and its alternate contact, the telephone receiver and transmitter at the called station, the upper intermediate armazture switch of relay 2i of the called line and its alternate contact, the wiper 15 of the connector switch and its engaged waiting contact, the upper armature switch of relay 92 and its normal contact, the second switch from the top of the winding of relay 84 and its normal contact, the uppermost switch of relay 6S and its engaged contact, the upper winding of relay 97 to the grounded battery 21. A second circuit is now established for the relay 54 traceable from the lower grounded switch of the relay 97 and its engaged contact, the winding of relay 541-, to the grounded battery 21, whereby this relay 54 is under the oint control of the calling and called stations and is not deengerized until the receivers at both stations are restored upon their switch hooks. lVhen both subscribers have restored their receivers upon their switch hooks the calling subscribers relay 55 and called subscribers relay 97 are deengerized so that both energizing circuits for the relay 54- are open and this relay 54 is dc/energized. The upper grounded armature switch of relay 54 is thus disconnected so as to remove ground from the cutofi relay 23 of the called line, relays 93, 53, 68, i2 and 2% of the calling line. \Vhen relay 42 is dccncrgized its lower armature switch establishes circuit for the release magnet 99 of the idle link selector switch A by way of the previously closed off normal switch 100, this circuit being apparent. The wipers of the idle link selector switch are restored to normal. \Vhen relay ul is deenergized ground is es tablished at its lower armature switch in connection with the release magnet 101 of the cinployed connector switch, this circuit including the previously closed off normal switch 102. \Vhcu circuit through the release magnet 101 is established the wipers of the connector switch are restored to normal. All the equipment pertaining to the calling 2n illustrated the instrument ilfltw 1:1 l' i is eii'ected by the relay :53 is the 'nllllig subscribers telephone rec iver, though chviously such an instrument might be a u pervisory relay in a manually controlled link if such link were included in a telephone circuit. Prior to the l'cspc of the called subscriber a circuit is pres i which includes the grounded circuit inicrrupiw 103, the uppermost armature switch of rclay 93 and its normal contact, the uppermost armature switch f relay 9? and its engaged contact, the winding of relay 82 and the grounded battery 21. The relay S2 is intermittently operated to break the shunt about the resistance coil 1(l-l ocrasiouiug dis tinct clicks in the telephone receiver of the calling subscriber, this resistance being then included in series with the upper winding of relay 55. When the called subscriber rcsponds and maintains his telephone receiver from its switch book no click is manifested in the telephone of the calling subscriber owing to the opening oi th circuit at the upper armature switch of relay iii. If the called subscriber should restore his receiver upon its switch hook before the calling subscriber restores his receiver upon its switch hook another circuit is established which includes circuit interrupter 10l, the uppermost armature switch of relay 93 and its alternate contact, the uppermost armature switch of relay 9? and its contact, the supervisory relay 82 and the grounded battery 21. The circuit interrupters 103 and 104 are of different character so that the frequencies of interruption of the circuits of the relay 82 are different whereby the callin subscriber will know, when the circuit including interrupter lOl is established, that the called subscriber has responded and restored his receiver upon its switch book.

The equipment associated with the called line is similar to that associated with the calling line and similar parts have similar characters of reference. At the bottom of Fig. 5 the connector switch is illustrated by the rectangle 105 as it will not be necessary to repeat the illustration of the connector switch shown at the top of Fig. 5.

It will not be necessary to show the mechanism of the switches employed for con necting the operator's telephone with the calling lines, the switches employed for sclecting idle link cir lu its, the connector switches employedfor cmnpleting conncc tions between calling and called lines, since such mechanism is well understood by those skilled in the art. Reference may be had to British Patent 1298 of 1910 and to Yan Deventers Telephonolagy, page 530, for an understanding of the actual mechanical design which may be employed. It will be observed that the connector and link selector switches disclosed by me lacks the usual side switches that were hitherto so common in automatic practice.

While I have herein shown and particularly described the preferred embodiment of the invention I do not wish to be limited to the precise details of construction and circuit arrangement shown as changes may readily be made without departing from the spirit of the invention.

Having thus described my invention 1 claim as new and desire to secure by Letters Patent the following 1. A telephone system including telephone lines extending from stations to an exchange; extensions for such telephone lines; an electromagnetic line extending connecting device; controlling circuits for governing the association of said line ex tending connecting device and individual to the dificrent positions of the switching,

parts of said line extending connecting device; operator controlled mea'ns for partially effecting modification of selected con trolling circuits for the the switching parts of the line extending connecting device in the positions corresponding to the controlling circuits selected for modification; apparatus governed by said controlling circuits for arresting the s itching parts of the line. extending connecting device and operated by such circuits when modified; and switching means governed by the line extending connecting dcvicc and operating jointly with the aforesaid operator controlled means for modify ing selected controlling circuits and brought into association with said controlling circuits individually whereby the apparatus for arresting the switching parts of the line extending connecting device is operatcd to arrest these switching parts in positions corresponding to the modified controlling circuits, there being present a plurality of circuits of diflerent character which are successively modified by the line l purpose of arresting extending connecting device and an electroniagnet operated to differing extents by the circuits controlled by the line extending connecting device and in turn operating upon the aforesaid line extending connecting device controlled switching means to bring the same individually into association with the aforesaid controlling circuits.

A telephone system including tele phone lines extending from stations to an exchange; extensions for such telephone lines; an electromagnetic line extending connecting device; controlling circuits for governing the association of said line extending connecting device and individual to the diiferent positions of the switching parts of said line extending connecting device; operator controlled means for partially efiecting modification of selected controlling circuits for the purpose of arresting the switching parts of the line extending connecting device in the positions corresponding to the controlling circuits sc lected ior modification; apparatus governed by said controlling circuits for arresting the switching parts of the line extending connecting device and operated by such circuits when modified; and means governed by the line extending connecting device and brought into association with said controlling circuits individually whereby the apparatus for hrresting the switching parts of the line extending connecting device is operated to arrest these switching parts in positions corresponding to the modified controlling circuits, there being present a 1;-l-iralit of circuits of dili'crent character which are successively modified by the line extending connecting device and an electromagnct operated to dill'm'ing extents by the circuits controlled by the line extending connecting device and in turn operating upon the aforesaid line extending conncct ing device controlled means to bring the same individually into association with the aforesaid controlling circuits.

In witness whereof. I hereunto subscribe my name this 7th day of October A. 1)., 1912.

M()RT()N L. JOHNSON.

\Vitnesses:

G. L. Came; lC'r'rA L. Wnrrn. 

